Calculate and graph fractional polynomials                    [STB-24: sg26.2]
------------------------------------------

    ^fpcurve^ [ [newvar] ^=^ exp] [^in^ range] [^if^ exp]

	^,^ ^p^owers^(^#[,#[,...]]^)^ [other_options]


calculates and graphs the fractional polynomial defined by the sequence
of ^powers()^.  If ^newvar^ is specified, the fractional polynomial is
saved in the new variable.  Fractional polynomials are defined in 
Royston and Altman (1994, STB-21: sg26).

Options
-------

^c^oef^(^#[,#[,...]]^)^ specifies the coefficients on each term in the 
	fractional polynomial.  By default, the coefficients are set to 1.

^con^stant^(^#^)^ specifies the constant.  By default, it is 0.

^l^ogpowers^(^#[,#[,...]]^)^ specifies the powers on factors in log(exp).  If
	this option is specified, the usual fractional convention concerning
	repeated powers is ignored and specified powers are applied literally.

^nog^raph suppresses the graph.

^o^bs^(^#^)^ specifies the number of observations to calculate when graphing
	against a range (i.e., when the current data set is empty).

^p^owers^(^#[,#[,...]]^)^ specifies the powers in the fractional polynomial.

^r^ange^(^min,max^)^ specifies the range over which to calculate the polynomial.
	When ^range()^ is specified, the ^= exp^ must be omitted.



Author
------

	Sean Becketti
	Stata Technical Bulletin
	EMAIL  stb@@stata.com


Also see
--------

    STB:  sg26.2 (STB-24); sg26.1 (STB-22); sg26 (STB-21)
On-line:  ^help^ for @fp@, @fpgraph@, @fpgen@, @fpplot@, @fpx@, @swfp@ if installed.